User Profile

Gogan · 10-31-2018, 10:18 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Now I fell like a moron...

Set the TV aside for a few days and yesterday it hit me: I've never traced the 2.2V and 3.1V coming from the PSU on the TCON

CN401 PIN14 was bent (3.1V coming from PSU)

Guess the original problem got to do with the transformer, or a cold joint, or even that 0Ohm resistor

It's working again

Thank you all for the support!...

Gogan · 10-26-2018, 06:08 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

About the red arrow: The first times I was checking the circuit I'm pretty sure I've checked that 0Ohm resistor and it was OK. Last time I was doing a quick check it felt inconsistent and I closed it. (24V were still droping at power on after that). But looking at the schematic It could not be opened or I wouldn't have had the 24V at all.

D401 is not shorted, but I'm not getting voltage at Gate, so Source is 0

24V start at 25V when I turn on the TV, then it reaches 27.2V, standby kills it (as...

Gogan · 10-24-2018, 08:14 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

This is getting weird

All of a sudden i have steady +27V all the way to CN402 COM, 3.4V on CN402 PIN1-4, but still no backlight

PL706
PIN1/2 - 27V
PIN3 - 3.1
PIN4 - 2.2

Gogan · 10-24-2018, 03:25 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

D401 and Q401 seem good

24V appear on D712/713

R781/782 are not present, 24V comes directly from Q707 (FDC642P from schematics)

C747/748 are not present

PL706 Pin 1/2 have 24V on boot them go down...

Gogan · 10-23-2018, 06:11 PM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Hi

Got a few updates

- Image is displayed, no backlight

- Horrible noise on PSU was solved with the new transformer, don't now if it was related to the problem or how long its been that way (TV's from my in-law).

- If PSU is disconnected from from TCON (CN401) 24V stays up

- If PSU is connected to TCON (CN401), with backlight (CN402) connected or not, 24V drops.

From what I understand BD9261EFV (U401) is a safety chip,...

Gogan · 10-20-2018, 04:00 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Yes, flashed a light, can't see anything

CN402
CH1 - 3.5/4.5V
COM - 5/7V (?)
CH2 - 2.5/4V
CH3 - 2.5/4V
CH4 - 3.5/4V

PL706 Pin 1 - 5.5/9V coming from PSU shoudn't be 12-24V?

Fuse F01 is OK...

Gogan · 10-18-2018, 02:33 PM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Fuse is good. Can't find any shorts on transistors, diodes and capacitors either...

Gogan · 10-18-2018, 07:25 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Tested all ecaps ESR, all seems good, replaced anyway

The C375 24v rising to 29v when PSU is connected and PL706 Pin1 dropping from 22V bellow 9V seems good?...

Gogan · 10-18-2018, 05:01 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Here they are...

Gogan · 10-18-2018, 04:16 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

Yes it is. Will post a picture of the whole back with cover of asap

The PSU noise, disconnected. It's not "normal" is it?
Also 24V and 12V seem a bit off. 23.25V and 11.25V reading (PSU disconnected)...

Gogan · 10-18-2018, 04:14 AM

Re: Toshiba 22EL833G with Vestel 17PW05-3

I guess it was a precipitated leap of faith

How can I do it?...

Gogan · 10-17-2018, 01:50 PM

Re: Toshiba 22EL833G with Vestel 17PW05-3

The obvious them. Ordered a new transformer, will update when it arrives...

Gogan · 10-16-2018, 07:02 PM

Re: New Members - please post your introductions here

Hello from Portugal!

Frequent reader and looking for help

Hope to share as well!

User Profile

Profile Sidebar

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Leave a comment:

Toshiba 22EL833G with Vestel 17PW05-3

Leave a comment: